[DSE] crash

[JonPsson1]

Reduced test case:
tc_dse.tar.gz

opt -mtriple=s390x-unknown-linux -mcpu=z16 -O3 -S ./tc_dse.ll

#6 0x0000000005287456 llvm::BasicAAResult::aliasCheck
#11 0x00000000048f0646 (anonymous namespace)::DSEState::isReadClobber
14 0x00000000049004d8 llvm::DSEPass::run
Segmentation fault (core dumped)

This is reported by user on F37 with clang-15, and is still failing on trunk.

@fhahn @BK1603 @nikic

[nikic]

llvm-reduce result for -passes=dse: https://gist.github.com/nikic/d52c888425c5d4ff3fbd37b4f84778b6

valgrind reports a use-after-free. Probably not invalidating EII correctly somewhere.

[fhahn]

Also reproduces with ASAn, looking now